URZADZENIE DO USZCZELNIANIA OPAKOWAN Z TWORZYWA TERMOPLASTYCZNEGO,ZWLASZCZA W PAKOWARKACH DO PAPIEROSOW LUB TYM PODOBNYCH ARTYKULOW

摘要

1515145 Seaming non-metallic sheet material GD SpA 4 July 1975 [10 July 1974] 28380/75 Heading B5K A heat sealing device, positioned adjacent a sealing station of an intermittently-rotatable wrapping wheel 1, comprises a reciprocable member 7 having a narrow heat sealing face, a heat source 10 adjacent the sealing face, and a probe 11 for measuring the temperature prevailing at the sealing face and responding thereto to control the heat sealing time of the device. The wrapping wheel 1 on which a packet P of cigarettes is wrapped in an outer thermoplastic sheet S is intermittently rotatable through 60 degree angles around a shaft 2 and comprises six radial compartments 3. At a station I, a packet P together with a sheet S is inserted into the compartment 3 thereat so that two ends of the sheet S protrude, these ends then being folded on to the external side of the packet P by a movable member 4 and an edge of a fixed guide 5. The folded ends are heat sealed at stations II, III through breaks in the guide 5 by members 7, 71 mounted on supports 8, 81 oscillatable about shafts 9, 91. An electrical resistor 10, 101 and a temperature measuring probe 11, 111 are inserted in the body of each member 7, 71. The parts of the wrap adjacent the sealing area are protected from irradiated heat by thermally insulating plates 12, 121, fixed to the guide 5. Each packet P is ejected by a pusher 6 into a channel 13, Fig. 2, in which the packet ends are sealed by reciprocable members 14, 141 mounted on supports 15, 151 and provided with heat sources 10, 101 and temperature measuring probes 11, 111. The members 14, 141 act on the packet ends through slits in thermally insulating plates 16, 161.